/*
 * @Description: number
 * @Author: rendc
 * @Date: 2022-09-26 11:02:47
 * @LastEditors: rendc
 * @LastEditTime: 2022-09-26 11:09:27
 */
var a = 1;
var b = 1;
var c = "1";
console.log(typeof a);
// 判断参数是否不是数值
// 如果参数不是数值  返回true
// 如果参数是数值    返回false
console.log(isNaN(a));
console.log(isNaN("a"));
console.log(typeof c);

// === 是全等匹配
console.log(a == b);
console.log(a === b);
console.log(a == c);
console.log(a === c);
